Pneumatic tire.



A. LATIMER.

PNEUMATIC TIRE.

APPLICATION FILED mm; a, 1907.

923,279. Patented June 1, 1909.

Ill-

Mr. 7M. 4%,, did/1M ALEXANDER LATIMER, OF LONDON, ENGLAND.

PNEUMATIC TIRE.

Specification of Letters Patent.

Patented June 1, 1909.

Application filed June 8, 1907. Serial No. 377,884.

To all whom it may concern: I

Be it known that I, ALnxAeinnR LATIMER,

.a subject of the King of Great Britain and England,

:31, 1907,) and I do hereby declare the following to betn full, clear,and exact description of the same.

This invention relates to the beads or thickened edges of pneumatic Tirecovers which serve for attaching the covers to wheel rims havinginturned edges by being forced into said edges, and is particularlyapplicable .to tire covers of large size for motor omnibuses and otherheavy road vehicles, and has for its object to rovide such covers withexternal extcnsib c and contractile beads, which can be readilyextended, so as to facilitate the lifting of the same over the edge ofthe wheel rim, and will automaticall contract or resile, and will berigid laterally in engagement with the wheel rim in such mannor as notto be liable to be blown out of such engagement.

To this end, the invention consists in forming such beads with cores ofclose coiled spring steel wire or llat strip coiled transversely tion ofthe wheel rim, and of a triangular shape having sides respectivelyadapted to lit externally against the tire cover against the wheel runand into the wheel rim inturned edge, and in securing such core to thecover by flexible means adapted to accommodate the desired extensibleand contractile action of the core.

spring steel,

On the accompanying drawings:Figure, 1, represents a transverse sectionof a canvas lmed tire cover adapted with an extensible and contractilebead according to the invention; and Figs, 2 and 3, are side viewsshowing other ways of securing the extensible and contractile bead tothe tire cover.

a, represents the extensible and contractile core, which may be coiledentire upon a circular mandrel, or in straight lengths which may becircularly sha ed, and riveted or otherwise connected at t 1e ends.

The core has a fiat side, a, adapted to lie against the outer side ofthe cover, I), and an gularly disposed sides, 0 a shaped to fit a ainstthe base and into the mturned edge oi the wheel rim it is intended tofit.

to the directlon of rota-- The extensible and contractile core may beattached to the cover outer side by rubbered canvas or fabric, 0,preferably weftless, embracin and holdin the core to the cover side, andliaving its edges, 0, stitched, as at c'-, to the rubber-ed canvas orfabric, b, forming the body of the cover, Fig, 1 after which themanufacture of the cover may be completed in a mold or otherwise in ausual 1 manner. 01', the core may be attached to the cover outer side byshort lengths oi rubbered cord, 0!, placed-side by side so as to embraceand hold the core to the cover side, and having their ends, (i flattenedagainst and stitched, as at d, to the cover side, Fig.,'2. Or, the. coremay be attached to the cover outer side by a continuous length l 01rubber-ed cord, e, laid to-and-lro so as to\ embrace and hold the core.to the cover side, 7 and having its bends, e flattened against andstitched, as at e, to the cover side, Fig, 3. Such flexible connectionsof the extensible and contractile core to the cover side yield so as toallow the beaded edge of 8 the cover to be readily lifted over the edgeof the wheel rim, and contract when the pneumatic pressure forces thebeads within the inturned edges of the rim, so that the cover is securedto the rim by the engage- 8 mcnt therewith of the outstanding extensibleand contractile bead in such manner as not to be liable to be blown outof such engagement.

What I do claim as my invention and dc 9 sire to secure byLetters-Patent is 1. An endless core for a beaded-edge for a pneumatictire cover, said core consisting of a close-coiled metal spring havingits convolutions in lateral abutment and made ol' 9 triangular crosssection with aninner flat side adapted to lie against the outer side ofthe cover.

2. An annular core for a beaded-edge for a pneumatic tire cover saidcore consisting of a 1 close-coiled spring made of flat steel striphaving its convolutions in ral abutment and made of triangular crosssection with an inner flat side adapted to lie against the outer side ofthe cover. 1t

3. In a beaded-edge for a pneumatic tire cover, in combination, anannular extensible and contractile bead-core consisting of a closecoiled metal spring having its convolutions in'lateral abutment and madeof 11 triangular cross section with an inner flat side and arranged withsuch side against the outer side of said cover adjacent to one of itsedges, and means embracing the core and adapted to accommodatejtsextension and contraction and serving-to secure it in position.

4. In a beaded-edge for a pneumatic tire cover, in combination, anannular extensible and contractile bead-core consistin of a close-coiledspring made of fiat stee strip having its convolutions in lateralabutment and made of trian lar cross section with an inner fiat side anarranged with such side against the outer side of said cover adjacent toone of its edges, and flexible means embracin said core and holding itin position and a epted to accommodate its extension and contraction andsecured to said cover at parts adjacent to the respective edges of saidside of said core.

5. In a beaded-edge pneumatic tire cover, in combination, an annularextensible and contractile bead-core consisting of a closecoiled metalspring'made of triangular cross section and arranged with one sideagainst the outer side of said cover adjacent to one of its edges, cordsarranged transversely of and made of triangular cross section with aninner fiat side and arranged with such 1de agamst the outer side of saidcover adtransversely of and locating said core and adapted toaccommodate the extension and contraction of said core, and meanssecuring said cords to said cover at parts adjasaid core.

In witness whereof I have hereunto set my hand in presence of twoWitnesses.

ALEXANDER LATIMER. Witnesses:

CHARLES AUBREY DAY. ALFRED DAY.

having its convolutions in lateral abutment jacent to one of its edges,cords arranged cent to the respective edges of said side of -i'

